__author__ = "Alex Li"

import threading
import time


def run(n):
    lock.acquire()
    global num
    num += 1
    lock.release()

lock = threading.Lock()
num = 0

t_objs = []  # 存线程实例
for i in range(50):
    t = threading.Thread(target=run, args=("t-%s" % i,))
    t.start()
    t_objs.append(t)  # 为了不阻塞后面线程的启动，不在这里join，先放到一个列表里

# for t in t_objs: #循环线程实例列表，等待所有线程执行完毕
#     t.join()


print("----------all threads has finished...", threading.current_thread(), threading.active_count())

print("num:",num)